EPE Association: EPE 2022 - DS1f: HF Power Converters

EPE 2022 - DS1f: HF Power Converters
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2022 ECCE Europe - Conference > EPE 2022 - Topic 02: Power Converter Topologies and Design > EPE 2022 - DS1f: HF Power Converters

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   A Three-Phase Isolated Secondary-Resonant Single-Active-Bridge DC-DC Converter with a Delta-Star Connected Transformer
By Atsushi NISHIO [View]
[Download]

Abstract: This paper presents a three-phase isolated secondary-resonant single-active-bridge DC-DC converter with a delta-star connected transformer. The total power factor of the transformer can be improved by using the LC resonance compared with a conventional converter. The effectiveness of the proposed circuit is verified by experiments using a 2.5 kW 265 V, 15 kHz laboratory prototype.

   Bus voltage regulation using sequential switching ZVZCS converters for spacecraft power systems
By Ausias GARRIGOS [View]
[Download]

Abstract: This work proposes a regulation technique for photovoltaic sources power bus based on quasi resonant zero-voltage, zero-current power switching cells controlled in a sequential manner to provide tight bus voltage regulation, fast transient response, and simple control loop design. This method has been devised for high-power bus regulated satellites following European Space Agency standards.

   Class-E Push-Pull Resonance Converter with Load Variation Robustness for Industrial Induction Heating
By Janus MEINERT [View]
[Download]

Abstract: Emerging wide bandgap devices are extending the operating frequency range and power handling capability of solid state based resonant power converter solutions. Presently, resonant power converters for industrial induction heating are using vacuum-tubes, achieving efficiencies of 50-65 \%. By replacing the prevalent vacuum tube technology with a solid state based solution, the efficiency of the industrial induction heating processes is expected to be increased. A design of a Class-E Push-Pull resonance converter using silicon carbide MOSFETs is proposed. A prototype, operating at 2.5 MHz, has been built showing a proof-of-concept of the topology at 4 kVA, achieving an efficiency of 91.8\% with a representative industrial induction heating load.

   Design of Planar Coupled Inductor Applied to Zero-Current Switching Clamped Current Converter
By Vinicius Freire BEZERRA [View]
[Download]

Abstract: This work focuses on the design and measuremental verification of a current source converter (CSC) with planar coupled inductor in the DC-link. Soft switching is achieved with a pseudo resonance interval between the stray inductor of the MOSFET and the output capacitor. Investigations about the improvement of the inductor are also discussed.

   Dynamic average small signal model of the SAB converter
By Alexis A. GÓMEZ [View]
[Download]

Abstract: In this article the average small signal model of the Single Active Bridge (SAB) converter is obtained.This converter can operate in two different conduction modes, Discontinuous Conduction Mode (DCM) and Continuous Conduction Mode (CCM). The SAB and the Phase-Shifted Controlled Full Bridge (PSFB) converter when operating in DCM present the same static behavior if the value of the inductor of the SAB is the same as the value of the output inductor of the PSFB referred to the primary side of the transformer. This conclusion can be extrapolated from the static analysis to the dynamic average small signal model, as such a first order model is obtained for this operating mode. However, when the SAB converter operates in CCM, the current through the inductor does not start at zero at the beginning of the switching period. Both small signal models are analyzed and confirmed by means of simulations.

   Mitigation of Dead-Time Effects on Transient DC Bias Elimination in Dual Active Bridge Link Current
By Mk Kharabela MOHANTA [View]
[Download]

Abstract: Transient DC bias elimination in the link current of the dual active bridge DC-DC converterunder power transients including dead-time effect is investigated in this paper. When a powerchange command is given to a dual active bridge, the modulation instants should be adjusted inan adequate manner in order to avoid over current during transients. The paper summarizes theadverse effect of the dead-time in applying DC-bias elimination techniques by dividing the entireoperating region into six different zones based on operating phase angles and in terms of deadtime. An improved compensation method (based on pre-, post- transition current waveformcomputation) to mitigate the dead-time effect is suggested. A detailed mathematical analysisis carried out to select the suitable switching instants. The proposal is demonstrated throughsimulation studies and through experimental verification.

   Novel current balancing method for HF interleaved converters with reducedcontrol effort
By Christian BECKEMEIER [View]
[Download]

Abstract: The Active Neutral Point Clamped (ANPC) topology as a three level inverter is particularly well suitedfor subdivision into fundamental switching semiconductors and modulating fast switching semiconductors. This allows each semiconductor to be selected for its best characteristics. One part of a hybrid ANPC inverter can be realized with high frequency interleaved stages based on wide bandgap power semiconductors. A challenge is the calculation effort of the duty cycle for this high switching frequency, especially due to the interleaved based stages. It is often considered that the reduction of the calculation effort has a negative impact on the current accounting. This paper proposes a simplified method for the balancing of the current in the interleaved stages with significantly reduced control frequency. An active current symmetry should be implemented, which would be easier due to the reduced control effort. In this paper, this method is experimentally validated without active current symmetry control.

   Optimal frequency for Dynamic Wireless Power Transfer
By Mincui LIANG [View]
[Download]

Abstract: To control the system for maximum power transfer, it is necessary to understand its behaviour for largerange of frequencies. Based on the time domain theoretical analysis of a Series-Series compensated WPT, the optimal frequencies to reach maximum power are proposed, considering the misalignment between the primary and secondary coils. It is further validated by a simulation case study. The theoretical and simulation results match well.

   Phase-Shift Modulation for Flying-Capacitor DC-DC Converters
By Philipp REHLAENDER [View]
[Download]

Abstract: Multi-level flying capacitor converters are an attractive solution for PFC and inverter stages due to their increased output frequency and the application of semiconductors of lower voltage. Due to the beneficial figure of merit of lower-voltage semiconductors switching losses and conduction losses can be reduced. Consequently, this paper analyzes the three-level flying capacitor (FC) module as a replacement for the conventional half bridge. It discusses flying-capacitor voltage control options when being employed for the conventional half-bridge LLC converter with a flying-capacitor inverter and proposes a simple-to-implement modulation to fully utilize the benefits of the three-level structure of the FC module. It explores potential applications to propose a flying capacitor phase shift converter and a three-phase three-level LLC resonant converter with a five-level line-to-line voltage.

   Static analysis and control strategies of the Single Active Bridge Converter
By Alexis A. GÓMEZ [View]
[Download]

Abstract: In this paper, a brief static analysis of the Single Active Bridge, a unidirectional isolated DC-DCconverter, is done. In this initial analysis the SAB is operating at a fixed frequency and controlled byvarying the duty cycle. Additionally, two variable frequency control strategies are proposed thatextends the soft-switching capabilities. This paper focuses on one of them that fixes the duty cycle anduses the switching frequency as the sole control variable. The conduction modes of the converter using the proposed control are analyzed and expressions for the voltage conversion ratio are obtained, which will be used in a design guide that provides ZVS over the full range of operation. A comparative current analysis is performed in which average, rms and switching currents of both control methods are depicted. Finally theoretical, simulation and experimental results are compared with good agreement.

   Transformer Design Optimization and Comparison for a DC-DC Converter used in PV Micro-Inverters
By Tobias MANTHEY [View]
[Download]

Abstract: The use of micro-inverters can lead to higher efficiency of photovoltaik systems, since shading problemsand system failures have only a small impact. The most significant component in terms of losses and moreover extensive in the design process is the transformer which is necessary for the galvanic isolationand topology-dependent voltage boost. This paper compares several optimization options, both simulatively and through measurement-based verification.

EPE 2022 - DS1f: HF Power Converters
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2022 ECCE Europe - Conference > EPE 2022 - Topic 02: Power Converter Topologies and Design > EPE 2022 - DS1f: HF Power Converters
	[return to parent folder]

	A Three-Phase Isolated Secondary-Resonant Single-Active-Bridge DC-DC Converter with a Delta-Star Connected Transformer By Atsushi NISHIO	[View] [Download]
Abstract: This paper presents a three-phase isolated secondary-resonant single-active-bridge DC-DC converter with a delta-star connected transformer. The total power factor of the transformer can be improved by using the LC resonance compared with a conventional converter. The effectiveness of the proposed circuit is verified by experiments using a 2.5 kW 265 V, 15 kHz laboratory prototype.

	Bus voltage regulation using sequential switching ZVZCS converters for spacecraft power systems By Ausias GARRIGOS	[View] [Download]
Abstract: This work proposes a regulation technique for photovoltaic sources power bus based on quasi resonant zero-voltage, zero-current power switching cells controlled in a sequential manner to provide tight bus voltage regulation, fast transient response, and simple control loop design. This method has been devised for high-power bus regulated satellites following European Space Agency standards.

	Class-E Push-Pull Resonance Converter with Load Variation Robustness for Industrial Induction Heating By Janus MEINERT	[View] [Download]
Abstract: Emerging wide bandgap devices are extending the operating frequency range and power handling capability of solid state based resonant power converter solutions. Presently, resonant power converters for industrial induction heating are using vacuum-tubes, achieving efficiencies of 50-65 \%. By replacing the prevalent vacuum tube technology with a solid state based solution, the efficiency of the industrial induction heating processes is expected to be increased. A design of a Class-E Push-Pull resonance converter using silicon carbide MOSFETs is proposed. A prototype, operating at 2.5 MHz, has been built showing a proof-of-concept of the topology at 4 kVA, achieving an efficiency of 91.8\% with a representative industrial induction heating load.

	Design of Planar Coupled Inductor Applied to Zero-Current Switching Clamped Current Converter By Vinicius Freire BEZERRA	[View] [Download]
Abstract: This work focuses on the design and measuremental verification of a current source converter (CSC) with planar coupled inductor in the DC-link. Soft switching is achieved with a pseudo resonance interval between the stray inductor of the MOSFET and the output capacitor. Investigations about the improvement of the inductor are also discussed.

	Dynamic average small signal model of the SAB converter By Alexis A. GÓMEZ	[View] [Download]
Abstract: In this article the average small signal model of the Single Active Bridge (SAB) converter is obtained.This converter can operate in two different conduction modes, Discontinuous Conduction Mode (DCM) and Continuous Conduction Mode (CCM). The SAB and the Phase-Shifted Controlled Full Bridge (PSFB) converter when operating in DCM present the same static behavior if the value of the inductor of the SAB is the same as the value of the output inductor of the PSFB referred to the primary side of the transformer. This conclusion can be extrapolated from the static analysis to the dynamic average small signal model, as such a first order model is obtained for this operating mode. However, when the SAB converter operates in CCM, the current through the inductor does not start at zero at the beginning of the switching period. Both small signal models are analyzed and confirmed by means of simulations.

	Mitigation of Dead-Time Effects on Transient DC Bias Elimination in Dual Active Bridge Link Current By Mk Kharabela MOHANTA	[View] [Download]
Abstract: Transient DC bias elimination in the link current of the dual active bridge DC-DC converterunder power transients including dead-time effect is investigated in this paper. When a powerchange command is given to a dual active bridge, the modulation instants should be adjusted inan adequate manner in order to avoid over current during transients. The paper summarizes theadverse effect of the dead-time in applying DC-bias elimination techniques by dividing the entireoperating region into six different zones based on operating phase angles and in terms of deadtime. An improved compensation method (based on pre-, post- transition current waveformcomputation) to mitigate the dead-time effect is suggested. A detailed mathematical analysisis carried out to select the suitable switching instants. The proposal is demonstrated throughsimulation studies and through experimental verification.

	Novel current balancing method for HF interleaved converters with reducedcontrol effort By Christian BECKEMEIER	[View] [Download]
Abstract: The Active Neutral Point Clamped (ANPC) topology as a three level inverter is particularly well suitedfor subdivision into fundamental switching semiconductors and modulating fast switching semiconductors. This allows each semiconductor to be selected for its best characteristics. One part of a hybrid ANPC inverter can be realized with high frequency interleaved stages based on wide bandgap power semiconductors. A challenge is the calculation effort of the duty cycle for this high switching frequency, especially due to the interleaved based stages. It is often considered that the reduction of the calculation effort has a negative impact on the current accounting. This paper proposes a simplified method for the balancing of the current in the interleaved stages with significantly reduced control frequency. An active current symmetry should be implemented, which would be easier due to the reduced control effort. In this paper, this method is experimentally validated without active current symmetry control.

	Optimal frequency for Dynamic Wireless Power Transfer By Mincui LIANG	[View] [Download]
Abstract: To control the system for maximum power transfer, it is necessary to understand its behaviour for largerange of frequencies. Based on the time domain theoretical analysis of a Series-Series compensated WPT, the optimal frequencies to reach maximum power are proposed, considering the misalignment between the primary and secondary coils. It is further validated by a simulation case study. The theoretical and simulation results match well.

	Phase-Shift Modulation for Flying-Capacitor DC-DC Converters By Philipp REHLAENDER	[View] [Download]
Abstract: Multi-level flying capacitor converters are an attractive solution for PFC and inverter stages due to their increased output frequency and the application of semiconductors of lower voltage. Due to the beneficial figure of merit of lower-voltage semiconductors switching losses and conduction losses can be reduced. Consequently, this paper analyzes the three-level flying capacitor (FC) module as a replacement for the conventional half bridge. It discusses flying-capacitor voltage control options when being employed for the conventional half-bridge LLC converter with a flying-capacitor inverter and proposes a simple-to-implement modulation to fully utilize the benefits of the three-level structure of the FC module. It explores potential applications to propose a flying capacitor phase shift converter and a three-phase three-level LLC resonant converter with a five-level line-to-line voltage.

	Static analysis and control strategies of the Single Active Bridge Converter By Alexis A. GÓMEZ	[View] [Download]
Abstract: In this paper, a brief static analysis of the Single Active Bridge, a unidirectional isolated DC-DCconverter, is done. In this initial analysis the SAB is operating at a fixed frequency and controlled byvarying the duty cycle. Additionally, two variable frequency control strategies are proposed thatextends the soft-switching capabilities. This paper focuses on one of them that fixes the duty cycle anduses the switching frequency as the sole control variable. The conduction modes of the converter using the proposed control are analyzed and expressions for the voltage conversion ratio are obtained, which will be used in a design guide that provides ZVS over the full range of operation. A comparative current analysis is performed in which average, rms and switching currents of both control methods are depicted. Finally theoretical, simulation and experimental results are compared with good agreement.

	Transformer Design Optimization and Comparison for a DC-DC Converter used in PV Micro-Inverters By Tobias MANTHEY	[View] [Download]
Abstract: The use of micro-inverters can lead to higher efficiency of photovoltaik systems, since shading problemsand system failures have only a small impact. The most significant component in terms of losses and moreover extensive in the design process is the transformer which is necessary for the galvanic isolationand topology-dependent voltage boost. This paper compares several optimization options, both simulatively and through measurement-based verification.